<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>3-1作业</title>
    <style>
        div {
            font-size: 14px;
            font-weight: bold;
            line-height: 50px;
            position: fixed;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            width: 200px;
            height: 50px;
            margin: auto;
            cursor: pointer;
            text-align: center;
            background: #abcdef;
            /*此处写代码*/
            transform: rotate(0deg);
            /* transition: transform 1s ease-in-out .2s; */
            transition-property: transform;
            transition-duration: .5s;
            transition-timing-function: ease-in-out;
            transition-delay: .2s;
        }

        /*此处写代码*/
        div:hover {
            transform: rotate(360deg) scale3d(2, 2, 2);
            transition-property: transform;
            transition-duration: .5s;
            transition-timing-function: ease-in-out;
            transition-delay: .2s;
        }
    </style>
</head>

<body>
    <div>www.imooc.com</div>
</body>

</html>